Hey everybody, I'm working on a vertical chimney, wich evacuate the gaz naturaly (naturel convection) but i stuck with the boundary conditions; does anyone can tell what to use at the inlet and outlet of the chimney, and how to tell Fluent that a depresion of -2285 Pa exist between the inlet and outlet? Thanks for helping me.

Pressure boundary conditions at inlet and outlet.

thank you Allan for your reponse, the boundary that you suggest me are OK, but how to introduce the value of the depression -2285Pa between the inlet and outlet?

Type it in. For example, set the static pressure at the bottom as 0 Pa and the top -2285 Pa. Am I missing something in your question? 2285 Pa difference from bottom to top is quite a bit for something like flue gas and should develop a relatively high velocity. Good Luck.

thank you Allan, I did this before but as you said i get a very high velocity witch does not verifie the experimental investigation, my problem is a chimney of 200 m,and i found that we have a depression of about -2285.

I know you guys would have a clue that would help me in my problem with modellng buoyancy in fluent. I would enjoy long conversations over e.mail or a talk over the phone, i am in UK and wouldn't mind calling across countries. my e.mail rahaernest(at)yahoo.co.uk

I would appreciate your support

Hi Allan

I know you guys would have a clue that would help me in my problem with modellng buoyancy in fluent. I would enjoy long conversations over e.mail or a talk over the phone, i am in UK and wouldn't mind calling across countries. my e.mail rahaernest(at)yahoo.co.uk

I would appreciate your support

Raha Ernest